Since commit #8783731f and #28139960 this option is not needed anymore.
I updated LUncov (which was the only plugin using it) to remove it as well

Do not use two distinct undo stacks for taking care of which symbols are in use
at a given program point. Let `Alpha` manages everything internally.

Previously, the parser only allowed attributes at beginning of a declaration
(like for `const`, `static`, ...). However, gcc accepts to have attributes
in the rest of the declaration (after the first comma, like for a pointer or
 array declarator).

Fixes #616

Given that the previous commits made so many whitespace changes, it'd be
a shame not to do it

Apparently things like that exist in untamed code bases. Fixes #615

Fixes issue #614

Fixes #617

Technically, the C standard distinguishes between declarations and statements,
and only the latter may have labels attached to them. Thus, printing a label
directly over a `Local_init` will result in ill-formed C code. In order to
avoid that, we add a dummy nop (aka `;`) in-between.

A first version was done in !1518, but failed to take into account
`UnspecifiedSequence` whose first element happens to be a `Local_init`